Senior Frontend Engineer

Building a New Foundation for Cloud Security

The best security control doesn't detect a bad action. It removes the ability to perform it in the first place.

That's what Act does. We're an action-centric cloud security company focused on reducing cloud risk by removing excessive and unintended access across cloud environments. As AI is making attacks faster and less predictable, patching and detection can only go so far. So we make sure every identity in the cloud, human or machine, has only the access it actually needs, without turning security into an operational burden.

We're early-stage, well-funded, and built by repeat security operators who previously created Medigate (acquired by Claroty). We're building a team of exceptional people who take ownership from idea to outcome, with the autonomy to make decisions and drive their work forward. We care deeply about the customer, move fast, and enjoy building together.

If you want to build something that matters from the ground up and see your work go live within days, this is the place.

The Role

We are looking for a Senior Frontend Engineer to join our team and own the user-facing experience of our cloud security platform. You’ll build a fast, intuitive, and data-dense product that lets security teams understand and act on complex cloud access data at a glance.

What You'll Do

• Design and build a modern, responsive web application using React and TypeScript

• Translate complex security and cloud data into clear, actionable, and intuitive UI/UX

• Build reusable component libraries and design systems that scale across the product

• Work closely with Product and Design to turn concepts into polished, production-ready features

• Optimize application performance, especially around large, data-heavy views (graphs, tables, dashboards)

• Collaborate with backend engineers to define clean, efficient APIs

• Leverage AI tools as part of your daily workflow - we build with AI, not just for AI

• Improve our codebase, tooling, and engineering practices as we grow

What you’ll bring

• At least 5 years of hands-on frontend development experience

• Strong proficiency in React and TypeScript, with deep understanding of modern frontend architecture

• Experience building complex, data-heavy UIs (dashboards, visualizations, tables at scale)

• Strong sense of UI/UX and attention to detail

• Familiarity with state management, testing, and performance optimization in large frontend codebases

• Experience working closely with backend and design teams

• Strong sense of ownership, clear communication, and ability to move fast without cutting corners

Our culture

We live by three values: Win, Learn, Have Fun. We play to win - we set ambitious goals and hold ourselves to high standards. We learn constantly - from customers, from each other, and from our mistakes. And we have fun doing it: we believe great work happens when people enjoy working together.